Attributed variously to the Companion Abdullah Ibn Abbas (d. 68/687) and to Muhammad ibn Ya‘qub al-Firuzabadi (d. 817/1414), Tanwîr al-Miqbâs is one of the most pivotal works for understanding the environment which influenced the development of Qur’anic exegesis. Despite its uncertain authorship and its reliance on the controversial Isrâ’îliyyat or Israelite stories, Tanwîr al-Miqbâs nevertheless offers readers valuable insight into the circulation and exchange of popular ideas between Islam, Judaism and Christianity during the formative phase of Islamic exegesis.